| APA | UDHN. (2012, February 14). In Acronym Geek. Retrieved 18:26, February 14, 2012, from http://www.acronymgeek.com/UDHN |
| MLA | "UDHN." Acronym Geek. (2012). Acronym Geek. 14 Feb 2012 <http://www.acronymgeek.com/UDHN>. |
| MHRA | 'UDHN', Acronym Geek, 14 February 2012, <http://www.acronymgeek.com/UDHN> [accessed 14 February 2012] |
| Chicago | "UDHN", http://www.acronymgeek.com/UDHN (accessed February 14, 2012). |
| CBE/CSE | UDHN [Internet]. Acronym Geek; 2012 Feb 14 [cited 2012 Feb 14]. Available from: http://www.acronymgeek.com/UDHN. |
| Bluebook | UDHN, http://www.acronymgeek.com/UDHN (last visited February 14, 2012). |
| Bluebook: Harvard JOLT | See Acronym Geek, UDHN, http://www.acronymgeek.com/UDHN (optional description here) (as of Feb. 14, 2012, 18:26). |
| AMA | UDHN. Acronym Geek. February 14, 2012, 18:26. Available at: http://www.acronymgeek.com/UDHN. Accessed February 14, 2012, 18:26. |